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    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
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    <title>Document</title>
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<body>
    <script>
        //async与await
        //使异步像同步一样
        async function a() {
            //return 'nihao';//返回的是一个promise
            //throw new Error('出错了')//抛出错误
            return new Promise((resolve, reject) => {
                reject('error')
            })
        }
        const result = a()
        console.log(result);
        result.then(value => {
            console.log(value);
        }, reason => {
            console.warn(reason);
        })
    </script>
</body>

</html>